21387960

素因数分解:

$2^3\times 3^2\times 5^1\times {\mathrm{11}}^2\times {\mathrm{491}}^1$

素因数の和:530

約数の個数: 144

約数和(自身を含む): 76560120

約数和(自身を除く): 55172160

約数列:

[1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 15, 18, 20, 22, 24, 30, 33, 36, 40, 44, 45, 55, 60, 66, 72, 88, 90, 99, 110, 120, 121, 132, 165, 180, 198, 220, 242, 264, 330, 360, 363, 396, 440, 484, 491, 495, 605, 660, 726, 792, 968, 982, 990, 1089, 1210, 1320, 1452, 1473, 1815, 1964, 1980, 2178, 2420, 2455, 2904, 2946, 3630, 3928, 3960, 4356, 4419, 4840, 4910, 5401, 5445, 5892, 7260, 7365, 8712, 8838, 9820, 10802, 10890, 11784, 14520, 14730, 16203, 17676, 19640, 21604, 21780, 22095, 27005, 29460, 32406, 35352, 43208, 43560, 44190, 48609, 54010, 58920, 59411, 64812, 81015, 88380, 97218, 108020, 118822, 129624, 162030, 176760, 178233, 194436, 216040, 237644, 243045, 297055, 324060, 356466, 388872, 475288, 486090, 534699, 594110, 648120, 712932, 891165, 972180, 1069398, 1188220, 1425864, 1782330, 1944360, 2138796, 2376440, 2673495, 3564660, 4277592, 5346990, 7129320, 10693980, 21387960]

約数ペア:

[(1, 21387960), (2, 10693980), (3, 7129320), (4, 5346990), (5, 4277592), (6, 3564660), (8, 2673495), (9, 2376440), (10, 2138796), (11, 1944360), (12, 1782330), (15, 1425864), (18, 1188220), (20, 1069398), (22, 972180), (24, 891165), (30, 712932), (33, 648120), (36, 594110), (40, 534699), (44, 486090), (45, 475288), (55, 388872), (60, 356466), (66, 324060), (72, 297055), (88, 243045), (90, 237644), (99, 216040), (110, 194436), (120, 178233), (121, 176760), (132, 162030), (165, 129624), (180, 118822), (198, 108020), (220, 97218), (242, 88380), (264, 81015), (330, 64812), (360, 59411), (363, 58920), (396, 54010), (440, 48609), (484, 44190), (491, 43560), (495, 43208), (605, 35352), (660, 32406), (726, 29460), (792, 27005), (968, 22095), (982, 21780), (990, 21604), (1089, 19640), (1210, 17676), (1320, 16203), (1452, 14730), (1473, 14520), (1815, 11784), (1964, 10890), (1980, 10802), (2178, 9820), (2420, 8838), (2455, 8712), (2904, 7365), (2946, 7260), (3630, 5892), (3928, 5445), (3960, 5401), (4356, 4910), (4419, 4840)]